The upload information seems to claim this is Bobby Valentine walking the streets, grunting like a lunatic. Information on reddit claims this is Bobby Valentine on the streets of Chicago. Obviously, Bobby Valentine is currently in Chicago to play the Cubs, but that's hardly a smoking gun.
It certainly looks like it could be Bobby Valentine. And—while he does not often grunt, to my knowledge—it does sounds like Bobby Valentine, too. So, I guess, the only question that remains is: what the fuck?
OK, I lied. There are millions of questions remaining here, but that is the most important one right now.